Yeah.. I had a lot of fun online with GTA 4's driving mechanics.
My favourite maneuver when I was being chased was get to high speed, do a handbrake 180, but make sure to hit reverse as soon as the back of the car is pointing in the direction I was originally going, as it will keep quite a lot of speed. At the point where I do the 180, a whole lot of players thought I was doing a 180 to try and double back on myself, i.e go the opposite direction to what we was already traveling, so they in turn do a handbrake 180, but because they didn't expect me to reverse and carry on going in the original direction, they lose a lot of speed and/or fuck up with a slow turn to resume chasing me. At this point I again do another 180 as I'm reversing so my car is once again facing the direction I was originally traveling, then pedal to the metal and lose the fuckers.
This maneuver seemed to work 10 times out of 10 on anyone I hadn't already done it on and even if I had already done it to someone multiple times and they now expect it, instead of reversing when I do the 180, I actually do just do a 180 and start driving in the opposite direction, many of them would drive straight past me because they then expected me to reverse lol.